丁醇为含有四个碳原子的饱和醇类，分子式C₄H₉OH，可以指下列四种化合物之一：

• 正丁醇（n-丁醇；丁-1-醇），常直接称为“丁醇”
• 异丁醇（iso-丁醇；2-甲基-1-丙醇）
• 仲丁醇（sec-丁醇；丁-2-醇）
• 叔丁醇（tert-丁醇；2-甲基-2-丙醇）

正丁醇	异丁醇	仲丁醇	叔丁醇

由于各异构体的差异，因此它们的溶点及沸点会稍有差异。在水溶性方面，丁醇比乙醇低，但比戊醇、己醇等更长碳原子链的醇高。丁醇与不少醇一样均带有毒性。

丁醇主要用作化学溶剂或燃料。

Butanol (also called butyl alcohol) is a four-carbon alcohol with a formula of C₄H₉OH, which occurs in four isomeric structures, from a straight-chain primary alcohol to a branched-chain tertiary alcohol; all are a butyl or isobutyl group linked to a hydroxyl group (sometimes represented as BuOH, n-BuOH, and i-BuOH). These are n-butanol, 2-butanol, tert-butanol, and isobutanol. Butanol is primarily used as a solvent, as an intermediate in chemical synthesis, and as a fuel. It is sometimes also called biobutanol when produced biologically.